JP2014162355A5 - - Google Patents

Claims (8)

A brake booster configured to assist the brake operating force by the operator;
An electric vacuum pump configured to supply negative pressure to the brake booster;
A degree of vacuum detecting means configured to detect a degree of vacuum in the brake booster;
Continuous operation time measuring means configured to measure the continuous operation time of the electric vacuum pump;
A brake comprising: a vacuum control unit configured to control the electric vacuum pump based on a vacuum level detected by the vacuum level detection unit and a continuous operation time measured by the continuous operation time measurement unit A system,
The pump control means, when the degree of vacuum is greater than a preset predetermined upper limit or when the continuous operation time is longer than a preset predetermined time, whichever is earlier, Configured to stop the electric vacuum pump ;
A plurality of vacuum tanks configured to store negative pressure supplied from the electric vacuum pump, between the electric vacuum pump and the brake booster;
Each of the plurality of vacuum tanks communicates so that the degree of vacuum is the same,
A first pressure switch attached to at least one of the plurality of vacuum tanks and configured to switch from a closed state to an open state when the degree of vacuum of the vacuum tank exceeds the predetermined upper limit;
A second pressure switch attached to at least one of the plurality of vacuum tanks and configured to switch from a closed state to an open state when the vacuum degree of the vacuum tank is equal to or lower than the predetermined lower limit; Further comprising
The brake system according to claim 1, wherein the vacuum degree detecting means is configured to detect a vacuum degree in the brake booster based on an open / closed state of the first pressure switch and the second pressure switch. It said pump control means when the vacuum becomes less than a preset predetermined lower limit value, actuates the electric vacuum pump, so as to start the continuous operation time measured by the continuous operation time measurement means brake system according to claim 1, characterized in that it is configured. Warning output means configured to output a warning when the degree of vacuum is less than the predetermined lower limit value when the continuous operation time measured by the continuous operation time measuring means reaches the predetermined time or more. The brake system according to claim 2, further comprising: The brake system according to claim 1, wherein the first pressure switch and the second pressure switch are attached to each of the plurality of vacuum tanks.   An industrial vehicle comprising the brake system according to any one of claims 1 to 4. A brake control method in the brake system according to any one of claims 1 to 4,
Detecting the degree of vacuum in the brake booster that assists the brake operating force by the operator ;
Measuring the continuous operation time of the electric vacuum pump that supplies negative pressure to the brake booster ;
The electric vacuum pump is stopped at the earlier timing when the degree of vacuum becomes larger than a preset upper limit value or when the continuous operation time becomes longer than a preset predetermined time. brake control method characterized by comprising the step of causing, the. 7. The method according to claim 6, further comprising the step of operating the electric vacuum pump and starting measuring the continuous operation time when the degree of vacuum becomes less than a predetermined lower limit value. Brake control method. The brake control method according to claim 7, further comprising a step of outputting a warning when the degree of vacuum is less than the predetermined lower limit value when the continuous operation time reaches the predetermined time or more. .